Oil burner preheater unit



FIG. 1 is a perspective view of the oil burner preheater unit embodyingthe design of the present invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The ornamental design for an oil burner preheater unit, as shown.